使用以下代码，在函数placeOrder（）中，我无法使用price []数组元素和chairAmtA（以及我拥有的以下数量变量）来进行计算。它总是以NaN的形式返回答案。代码有什么问题，如何解决？
<title>
Ryan Weiland, Assignment 2
</title>
<!--Load stylesheet-->
<link rel="stylesheet" type="text/css" href="assignment2.css">
<!--Load description variables-->
<script type="text/javascript" src="script.js" >
</script>
<script>
<!--Initilize variables for calculations-->
var chairCost = 50;
var deskCost = 150;
var rockerCost = 250;
var tableCost = 200;
var ftstlCost = 75;
var fname;
var lname;
var streetName;
var cityName;
var state;
var zip;
var phoneOne;
var phoneTwo;
var phoneThree;
var chairAmt;
var deskAmt;
var rockerAmt;
var tableAmt;
var ftstlAmt;
function orderTotal(){
//window.alert("This Function Works");
//Personal Information
var fname = document.items.first.value;
var lname = document.items.last.value;
var streetName = document.items.street.value;
var cityName = document.items.city.value;
var state = document.items.state.value;
var zip = document.items.zipCode.value;
var phoneOne = document.items.pOne.value;
var phoneTwo = document.items.pTwo.value;
var phoneThree = document.items.pThree.value;
//Item Aomount
chairAmt = document.items.chairs.value;
deskAmt = document.items.desks.value;
rockerAmt = document.items.rockers.value;
tableAmt = document.items.tables.value;
ftstlAmt = document.items.ftstls.value;
//Calculations
//Chair Total
var costChairT = chairAmt*chairCost;
//Desk Total
var costDeskT = deskAmt*deskCost;
//Rocker Total
var costRockerT = rockerAmt*rockerCost;
//Table Total
var costTableT = tableAmt*tableCost;
//Footstool Total
var costFtstlT = ftstlAmt*ftstlCost;
//Overall Total Cost
var totalCost = costChairT + costDeskT + costRockerT + costTableT + costFtstlT;
//Personal Total
var personalTotal = fname + " " + lname + "\n" + streetName + ", \n" + cityName + " " + state + ", \n" + zip + "\nPhone Number: " + phoneOne + "- " + phoneTwo + "- " +phoneThree + "\n";
//New window with everything retrieved
window.alert(personalTotal + "Total Cost: $" + totalCost);
}
function placeOrder(chairsAmt, desksAmt, rockersAmt, tablesAmt, ftstlsAmt) {
//window.alert("placeOrder runs");
var order = [];
//Prices in array
var prices = [50, //Chair
150, //Desk
250, //Rocking Chair
200, //Table
75]; //Footstool
//Personal Information
order[0] = document.items.first.value;
order[1] = document.items.last.value;
order[2] = document.items.street.value;
order[3] = document.items.city.value;
order[4] = document.items.state.value;
order[5] = document.items.zipCode.value;
order[6] = document.items.pOne.value;
order[7] = document.items.pTwo.value;
order[8] = document.items.pThree.value;
//Item Aomount
var chairAmtA = document.items.chairs.value;
var deskAmtA = document.items.desks.value;
var rockerAmtA = document.items.rockers.value;
var tableAmtA = document.items.tables.value;
var ftstlAmtA = document.items.ftstls.value;
var prices = "Prices\nChair: " + prices[0] + "\nDesk: " + prices[1] + "\nRocking Chair: " + prices[2] + "\nTable: " + prices[3] + "\nFootstool: " + prices[4] + "\n\n";
//Chair Total
var chairCostA = chairAmtA * prices[0];
//Desk Total
var deskCostA = deskAmtA * prices[1];
//Rocker Total
var rockerCostA = rockerAmtA * prices[2];
//Table Total
var tableCostA = tableAmtA * prices[3];
//Footstool Total
var ftstlCostA = ftstlAmtA * prices[4];
//Overall Total Cost
var totalCostA = chairCostA + deskCostA + rockerCostA + tableCostA + ftstlCostA;
//Personal Total
personalTotalA= order[0] + " " + order[1] + "\n"
+ order[2] + ", " + order[3] + "\n"
+ order[4] + ", " + order[5] + "\n"
+ "Phone Number: " + order[6] + "-" + order[7] + "-" + order[8] + "\n\n";
//Quantity ordered
var quantity = "Chairs Ordered: " + chairAmtA + "\nDesks Ordered: " + deskAmtA + "\nRocking Chairs Ordered: " + rockerAmtA + "\nTables Ordered: " + tableAmtA + "\nFootstools Ordered: " + ftstlAmtA + "\n\n";
//New window with everything retrieved
var x = window.confirm(personalTotalA + quantity + prices + "\nTotal Cost: $" + totalCostA);
if(x ==true)
window.alert("Your order has been placed!");
else
window.alert("Your order has been cancled.");
}
</script>
<h1>Swanson's Woodworking</h1>
<h2>Customer Order Form</h2>
<br />
<!--List of items-->
<form name="items">
<br />
<br />
<!--Chair-->
Click the button for a description.
<input type="radio" name="items" onclick="document.item.itemDesc2.value=chairDesc" />
<b>Chair($50)</b>
<br />
<!--Desk-->
Click the button for a description.
<input type="radio" name="items" onclick="document.item.itemDesc2.value=deskDesc" />
<b>Desk($150)</b>
<br />
<!--Rocking Chair-->
Click the button for a description.
<input type="radio" name="items" onclick="document.item.itemDesc2.value=rockerDesc" />
<b>Rocking Chair($250)</b>
<br />
<!--Table-->
Click the button for a description.
<input type="radio" name="items" onclick="document.item.itemDesc2.value=tableDesc" />
<b>Table($200)</b>
<br />
<!--Footstool-->
Click the button for a description.
<input type="radio" name="items" onclick="document.item.itemDesc2.value=ftstlDesc" />
<b>Footstool($75)</b>
<br />
<!--Textarea for descriptions-->
<p>
<textarea name="itemDesc2" cols="30" rows="5" style="background-color: transparent; border: 1; font-size:20px; overflow: hidden; color: #5e0000">
</textarea>
</p>
<!--Information Form-->
<!--Personal Information-->
First Name: <input type="text" name="first">
<br /><br />
Last Name : <input type="text" name="last">
<br /><br />
Street Address:<input type="text" name="street">
<br /><br />
City: <input type="text" name="city">
<br /><br />
State: <input type="text" name="state">
<br /><br />
Zip Code: <input type="text" name="zipCode">
<br /><br />
Phone Number: (<input type="text" name="pOne" size="3">) - <input type="text" name="pTwo" size="3"> - <input type="text" name="pThree" size="4">
<br /><br />
<!--List of items-->
Chairs Desired: <input type="number" name="chairs">
<br /><br />
Desks Desired: <input type="number" name="desks">
<br /><br />
Rocking Chairs Desired: <input type="number" name="rockers">
<br /><br />
Tables Desired: <input type="number" name="tables">
<br /><br />
Footstools Desired: <input type="number" name="ftstls">
<br /><br />
</form>
<!--Calculate your total order.-->
<input type = "button" onclick = "orderTotal()" value = "Calculate your total order" > <!--Button for total-->
<br /><br >
<input type = "button" onclick = "placeOrder()" value = "Place Order" > <!--Button for total-->
答案 0 :(得分：0)
看起来你试图减去两个字符串：
console.log("12"-"13");
您需要将所有输入（它们是字符串）转换为数字：
val=input.value.toNumber();
或者：
VAL =（+ input.value）;